JPH09329896A - Image forming material and image forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the task that the dot reproduction range by halation is narrow and to make it possible to form stable multicolor images by incorporating a hydrophilic UV absorbent into an overcoating layer. SOLUTION: The image forming material provided with a release layer and a photosensitive colored layer in this order on a base is provided with the overcoating layer contg. the hydrophilic UV absorbent on the photosensitive colored layer. This overcoating layer is formed by using an overcoating layer coating liquid, directly coating the surface of the photosensitive colored layer with this liquid and drying the coating. A method for coating the surface of a sheet-like base material with this coating liquid and drying the coating, then superposing the coated base material on the photosensitive colored layer to provide the surface of the photosensitive colored layer with the overcoating layer is adoptable as well. A hydrophilic material contains the UV absorbent in the overcoating layer. In the case a protective film is laminated on the overcoating layer, a release agent is further incorporated therein. As a result, halation is prevented and the images having the good dot reproducibility is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a colored image forming material and an image forming method suitable for producing a color proof or the like for color proofing in color printing. Handleability,
The present invention also relates to an image forming material and an image forming method which are excellent in alignment accuracy.

[0002]

2. Description of the Related Art Color proofing is generally performed by proof printing as a pre-step of main printing in multi-color printing. The photosensitive transfer sheet for color proofing (color proofing sheet) exposes the image forming material through the decomposition mesh film for each color plate, and then develops with a developer to form a decomposed image on the photosensitive layer. It can be obtained by transferring this decomposed image onto any transfer material. Further, a multicolor image can be obtained by repeating the step of transferring a separated image of another color onto the material to which the separated image is transferred. As a method for producing a multicolor transfer image using a color sheet for color proofing, there is, for example, JP-A-47-41.
No. 830, a direct transfer system in which a colored image is directly transferred and laminated on a final image receiving paper, and an indirect transfer system, in which a colored image is temporarily transferred onto a temporary image receiving sheet, described in JP-A-59-97140. Further, a method of repeating the step of forming an image after transferring the colored photosensitive layer to an image receiving paper, as described in JP-A-56-50127, may be mentioned. In all of these methods, the surface of the material to which the image is formed is covered with an organic polymer, so the glossiness of the obtained image surface is too high, giving an impression different from the image quality during actual printing. Had a problem. Therefore, in order to solve this problem, an image forming material in which a photosensitive colored layer is peelably provided on a support is used, and only a colored image is transferred onto a transferred material and laminated to form a multicolor image. A so-called “image-only transfer” method for forming a film was considered. In this method, since there is no coating of the organic polymer layer on the material to be transferred, it is possible to obtain an image which is very close to the image quality at the time of actual printing.

The image-forming material used in the image-only transfer method easily transfers only the image from the support to the material to be transferred at the time of transfer, so that the softening point of the photosensitive coloring layer is lowered and the tackiness is improved. It is preferable. Therefore, the mechanical strength of the photosensitive colored layer is lowered. On the other hand, in the image-only transfer method, the separated mesh film for each color plate is brought into close contact with the image transfer material, exposed, and the developed product is directly transferred to the transferred material. In order to reproduce without causing this, exposure is generally performed from the support surface side of the photosensitive colored layer. Therefore, during exposure, the photosensitive colored layer side is generally brought into close contact with the exposure device. Therefore, in order to prevent fusion between the photosensitive colored layer and the base of the exposure machine during exposure, to prevent deformation of the photosensitive colored layer at that time, and to shield oxygen during exposure, overcoating on the photosensitive colored layer It has been proposed to provide a coat layer, and further to further laminate a protective film on the overcoat layer in consideration of storage and transportation over time (JP-A-7-9).
2666). Halation is a problem when a film is overlaid on such a photosensitive image forming material and exposed. Halation is a phenomenon in which light used for exposure cannot be sufficiently absorbed only by the colored photosensitive layer, but is scattered when passing through the colored photosensitive layer and reflected back. For this reason, the peripheral portion, which was originally not supposed to be exposed, is also exposed to light, and the photo-curable (negative) photosensitive colored layer cannot be exposed except for a minute portion, and becomes solid. There is a problem that the so-called dot reproduction range is narrow. For example, when exposed with a film having 90% halftone dots, the remaining 10% portion, which should be uncured originally, is cured and becomes solid. On the exposure machine side, some measures such as making the table a black light absorbing type have been made, but this is not sufficient.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem that the halftone dot reproduction range due to halation is narrow and to provide an image forming material capable of producing a stable multicolor image. .

[0005]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventors have found that the above-mentioned problems can be solved by incorporating a water-affinitive ultraviolet absorber into the overcoat layer. The present invention has been reached.

That is, the gist of the present invention is to provide an image forming material in which a release layer and a photosensitive coloring layer are provided in this order on a support, and a water-affinitive ultraviolet absorber is provided on the photosensitive coloring layer. An image forming material characterized in that an overcoat layer containing the same is provided.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. If the support used in the present invention has resistance to a developer and dimensional stability to heat,
It may be made of any material, for example, polyolefin such as polypropylene, polyester such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, nylon 6, nylon 6 and nylon 6
Examples of the synthetic resin film include polyamides such as / 6 and the like, polyester amides, polycarbonates, polyether ketones, and copolymers and mixtures thereof. As an example of the copolymer, for example, polyester is a polyester obtained by using aromatic dicarboxylic acid or its ester and glycol as main starting materials. Above all, 80% or more of repeating structural units are ethylene terephthalate units or ethylene-2,6. -Polyesters with naphthalate units are preferred. Examples of the copolymerization component in this case include aromatic dicarboxylic acid components such as isophthalic acid, phthalic acid, adipic acid and sebacic acid, and oxycarboxylic acid components such as p-oxyethoxybenzoic acid and p-oxyethoxybenzoic acid.
-Oxybenzoic acid and the like can be mentioned, and glycol components include diethylene glycol, propylene glycol, butane glycol, cyclohexanedimethanol, neopentyl glycol and the like. However, in this case, the most preferable is a homopolymer of polyethylene terephthalate, and a biaxially stretched polyethylene terephthalate film is particularly preferable.

It is preferable that these supports are colorless and transparent in terms of enabling exposure from the surface on which the photosensitive colored layer is not provided, and the transparency is preferably as high as possible. Further, those which do not contain a light absorber such as an ultraviolet absorber are suitable. Further, the support of the present invention preferably has a small maximum thermal expansion coefficient and a small orientation angle in order to reduce color misregistration due to the difference in thermal expansion coefficient between the longitudinal direction and the lateral direction during transfer.

In addition, inorganic particles such as silica, alumina, kaolin and talc may be added to the support of the present invention to improve the handling property. The thickness of the support is not particularly limited, but is preferably from 10 to 300 μm, more preferably from 50 to 300 μm, from the viewpoint of mechanical strength and heat conduction during transfer.
150 μm.

In the present invention, a release layer is provided on the support in order to improve the transferability of the image formed on the support. For the release layer, for example, a vinyl acetate-based copolymer such as an ethylene-vinyl acetate copolymer, an ethylene-propylene-vinyl acetate copolymer or a modified product thereof is used. In consideration of transferability, an ethylene-vinyl acetate copolymer having a softening point of 50 to 120C is more preferable.

A method for forming a release layer using an ethylene-vinyl acetate copolymer is disclosed in JP-A-3-18194.
Examples of the method include coating, drying, dry laminating method, hot melt laminating method, and coextrusion method as disclosed in Japanese Patent Publication No. Other components of the release layer include, for example, JP-A Nos. 51-5101 and 59-97140.
Nos. 63-2040 and the like, for example, alcohol-soluble polyamide, alcohol-soluble nylon, a blend of partially esterified resin of a copolymer of styrene and maleic anhydride and methoxymethylated nylon, Polymers of acrylic acid and its derivatives, polyvinyl chloride, polyvinyl butyrate, cellulose acetate and the like can also be contained. The thickness of the release layer is preferably 5
To 200 μm, more preferably 10 to 100 μm
It is. The release layer is also preferably colorless and transparent.

The photosensitive colored layer of the present invention may be one layer by itself, but is not limited thereto, and a colored layer containing at least a colorant and a binder, and a photosensitive layer containing at least a photosensitive composition and a binder. It can also be divided into two layers. In this case, either layer may be present on the release layer side or the transparent support side. In the following description, the photosensitive colored layer mainly composed of one layer will be described. Therefore, unless otherwise specified, the term "photosensitive layer" means a photosensitive colored layer.

For the photosensitive layer, a photopolymerizable composition (for negative type photosensitive layer), quinonediazide compound (for positive type), diazo compound (for negative type), azide compound (for negative type), etc. can be used. . When the photosensitive layer is formed by a photopolymerizable composition, a monomer compound such as a polyfunctional vinyl monomer or a vinylidene compound capable of forming a photopolymer by at least one addition polymerization, and a photopolymerization initiation activated by actinic rays And a thermal polymerization inhibitor, if necessary.

The vinyl monomer or vinylidene compound which can be used in the photopolymerizable composition is preferably an unsaturated ester of polyol, particularly an ester of acrylic acid or an ester of methacrylic acid. Specific examples include ethylene glycol diacrylate, glycerin triacrylate, polyacrylate, ethylene glycol dimethacrylate, 1,3-propanediol dimethacrylate, polyethylene glycol dimethacrylate, 1,2,4-butanetriol trimethacrylate, trimethylolethane. Triacrylate, pentaerythritol dimethacrylate, pentaerythritol trimethacrylate,
Pentaerythritol tetramethacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol polyacrylate, 1,
Examples include, but are not limited to, 3-propanediol diacrylate, 1,5-pentanediol dimethacrylate, polyethylene glycol bisacrylate and bismethacrylate having a molecular weight in the range of 200-400.

The photopolymerization initiator and the thermal polymerization inhibitor are not particularly limited, and known compounds can be used. Next, examples of the quinonediazide compound used for forming the photosensitive layer include ester compounds of o-naphthoquinonediazide sulfonic acid and a polycondensation resin of phenols and aldehydes or ketones.

Examples of the phenols include monohydric phenols such as phenol, o-cresol, m-cresol, p-cresol, 3,5-xylenol, carvacrol and thymol, and dihydric phenols such as catechol, resorcinol and hydroquinone. , Trivalent phenols such as pyrogallol and phloroglucin. Examples of the aldehyde include formaldehyde, benzaldehyde,
Examples include acetaldehyde, crotonaldehyde, and furfural. Preferred among these aldehydes are formaldehyde and benzaldehyde.

Further, examples of the above-mentioned ketone include acetone and methyl ethyl ketone. Specific examples of the polycondensation resin include phenol / formaldehyde resin, m-cresol / formaldehyde resin, m-, p
-Mixed cresol / formaldehyde resin, resorcin / benzaldehyde resin, pyrogallol / acetone resin and the like.

The condensation rate of o-naphthoquinonediazide sulfonic acid with respect to the hydroxyl groups of phenols of the o-naphthoquinonediazide compound (reaction rate for one hydroxyl group) is
15 to 80% is preferable, more preferably 20 to 45%
It is. The polymer compound containing o-quinonediazide used in the present invention preferably has a weight average molecular weight of 1,000 or more, more preferably 1,500 or more, in consideration of coating properties.

Further, examples of the o-quinonediazide compound used in the present invention include the compounds described in JP-A-58-43451. Also, 2,3,4-trihydroxybenzophenone, 2,3,4,4′-tetrahydroxybenzophenone, 2,3,4,2 ′, 4′-
Pentahydroxybenzophenone, 2,3,4,3 ',
Condensed compounds of 4 ', 5'-hexahydroxybenzophenone and the like and orthoquinonediazidosulfonic acid can also be used.

Of the above o-quinonediazide compounds,
O-Quinone diazide ester obtained by reacting 1,2-naphthoquinonediazidosulfonyl chloride with 1,2-naphthoquinonediazide sulfonyl chloride and a condensate of pyrogallol / acetone condensed resin or novolak resin or 2,3,4-trihydroxybenzophenone Compounds are most preferred.

As the o-quinonediazide compound used in the present invention, the above compounds may be used alone or in combination of two or more kinds. The preferred amount of the o-quinonediazide compound used is as follows.
It is 10 to 40 parts by weight with respect to 00 parts by weight. The diazo compound is represented by a condensate of p-diazodiphenylamine and formaldehyde, and is preferably disclosed in JP-B-47-1167 and JP-B-57-43890.
Water-insoluble and ordinary organic solvent-soluble compounds described in JP-A-2006-163, etc. are used.

Further, as the azide compound, an aromatic diazide compound having an azide group bonded to an aromatic ring directly or through a carbonyl group or a sulfonyl group is preferably used. For example, polyazide styrene, polyvinyl-p- as described in U.S. Pat. No. 3,093,311.
Azidobenzate, polyvinyl-p-azidobenzal, a reaction product of an azidoarylsulfonyl chloride and an unsaturated hydrocarbon polymer described in JP-B-45-9613, a polymer having a sulfonyl azide or a carbonyl azide, etc. JP-A-43-21017, 4
4-22954 and 45-24915).

Typical examples of the binder resin used in the photosensitive layer include novolac resins, acrylic resins, vinyl acetate resins, polyurethane resins and epoxy resins. For example, as the novolac resin, a phenol / cresol / formaldehyde copolycondensation resin as described in JP-A-55-57841, JP-A-55
The copolycondensation resin of p-substituted phenol and phenol or cresol and formaldehyde described in JP-A-127553 is mentioned. As the vinyl acetate resin, the vinyl acetate-vinyl versatate copolymers described in JP-A-3-48248 and JP-A-3-181947 are preferably used.

The photosensitive layer contains an appropriate colorant. Dyes and pigments can be used as the colorant. For example, yellow, magenta, cyan, and black pigments and dyes, and other metal powders, white pigments, and fluorescent pigments can be used. The following examples are just a few of the many pigments and dyes known in the art. (CI stands for color index.)

[0025]

Table 1 Victoria Pure Blue (CI. 42595) Auramine (CI. 41000) Catillon Brilliant Flavin (CI. Basic 13) Rhodamine 6GCP (CI. 45160) Rhodamine B (CI. 45170) Safranine OK 70: 100 (CI. 50240) Erioglaucin X (CI. 42080) First Black HB (CI. 26150) No. 1201 Lionol Yellow (CI 21090) Lionol Yellow GRO (CI 21090) Shimura-First Yellow 8GF (CI 21105) Benzidine Yellow 4T-564D (CI 21095) Shimura-First Red 4015 (C.I. 12355) Rionol Red 7B4401 (C.I. 15830) Fastgen Blue TGR-L (C.I. 74160) Rionol Blue SM (C.I. 26150) Mitsubishi Carbon Black MA-100 ( Mitsubishi Chemical Co., Ltd.) Mitsubishi Carbon Black # 30, # 40, # 50 (manufactured by Mitsubishi Chemical Co.) Cyanine Blue 4920 (manufactured by Dainichiseika) Seika Fast Carmine 1483 (manufactured by Dainichiseika) Seika First Yellow H- 7005, 2400 (Dainichi Seikasha)

The amount of the colorant compounded in the photosensitive layer can be determined in consideration of the target optical density and the removability of the photosensitive layer with a developing solution. For example, for dyes, it is generally preferably 5 to 75% by weight, for pigments it is generally preferably 5 to 90% by weight, more preferably both are 5 to 50%. The film thickness of the photosensitive layer can be selected depending on the target optical density, the type of colorant (dye, pigment, carbon black) used in the photosensitive layer and the content thereof, but the thinner the film, the better the resolution. Higher and better image quality. Therefore, the film thickness is 0.1 to
Preferably, it is used in the range of 5 μm. More preferably, it is 0.5 to 4 μm. In the photosensitive layer, in addition to the above-described materials, a plasticizer, a coating improver, and the like can be further added as necessary.

Examples of the plasticizer include various low molecular weight compounds such as phthalic acid esters, triphenyl phosphates and maleic acid esters, and examples of the coating property improver include ethyl cellulose and polyalkylene ether. Examples of the surfactant include nonionic surfactants and the like, and fluorine-based surfactants.

The photosensitive layer is generally formed by dissolving a photosensitive composition, an optional colorant, and an appropriate binder in an appropriate solvent to prepare a coating solution, which is applied on the release layer. can do. Examples of the solvent that can be used include methyl lactate, ethyl lactate, methyl ethyl ketone, cyclohexanone, ethylene dichloride, dichloromethane, acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether. , Ethylene glycol monoethyl ether acetate, N, N-dimethylformamide, dimethyl sulfoxide, N, N-dimethylacetamide, acetylacetone, dioxane, tetrahydrofuran, γ-butyrolactone, propylene glycol monomethyl ether,
Propylene glycol monoethyl ether acetate,
Propylene glycol monoethyl ether acetate,
Diethylene glycol dimethyl ether, diethylene glycol diethyl ether, etc. can be used. Particularly preferred is methyl lactate or methyl ethyl ketone, or a mixture of these with other solvent as the main component.

The coating method for coating these colored photosensitive layers on the release layer is, for example, roll coating,
Reverse roll coating, dip coating,
Air knife coating, gravure coating, gravure offset coating, hopper coating,
Methods such as blade coating, rod coating, wire doctor coating, spray coating, curtain coating, and extrusion coating are used.

In order to provide a plurality of layers, such as when the photosensitive colored layer is divided into a colored layer and a photosensitive layer, and when an overcoat layer is further coated on the photosensitive colored layer, coating is performed for each layer. After drying, the multi-layer coating method that winds up, multiple coaters and dryers are installed side by side on one line,
A method of providing a plurality of layers by one-time conveyance of the support (for example, JP-A-63-69574) can be used. Drying is performed by blowing heated air onto the coated surface. The heating temperature is preferably 30 to 200 ° C, and particularly preferably 40 to 140 ° C. During drying, a method of drying the colored photosensitive layer while keeping the temperature of the heated air constant is generally performed, but a method of drying by gradually increasing the temperature of the heated air may also be performed. it can. Also, the heated air is 0.1
It is preferably supplied at a rate of -30 m / sec, and particularly preferably at a rate of 0.5-20 m / sec.

The overcoat layer in the present invention is provided mainly for protecting the surface of the photosensitive colored layer or for preventing the influence of oxygen when the photopolymerizable substance is contained in the photosensitive colored layer. The thickness of the overcoat layer is 0.1
~ 5 g / m ² is suitable, and more preferably 0.2 to 1
g / m ² . If it is too thick, it hinders development. The overcoat layer needs to move from the photosensitive colored layer to the developing solution during development and not exist on the photosensitive colored layer during transfer. In order to prevent environmental problems and the photosensitive colored layer from being dissolved more than necessary, the normal developer is a water-based solution, so the basic performance of the overcoat layer is that it is not water-friendly. Don't Therefore, the overcoat layer is preferably formed of a water-affinitive polymer and an additive which is not necessarily water-affinitive but is preferably water-affinitive.

As the water-soluble polymer which can be dissolved or swelled in the developer used in the overcoat layer, polyvinyl alcohol, polyethylene oxide,
Polyacrylic acid, polyacrylamide, polyvinyl methyl ether, polyvinyl pyrrolidone, polyamide, gum arabic, glue, gelatin, casein, celluloses (eg, viscose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose, etc.), starch Examples thereof include soluble starch, modified starch and the like. These polymers can be used alone or in combination. Among these polymers, those which are easily dissolved in water are preferable from the viewpoint of easy development. A smaller molecular weight is preferable because the dissolution rate is faster. From these points, polyvinyl alcohol having a polymerization degree of 1500 or less, a viscosity of 100 cps or less (2% aqueous solution, 20
(° C.) Methylcellulose or hydroxypropylmethylcellulose are particularly preferred. The overcoat layer is provided by directly coating and drying on the photosensitive coloring layer using the coating liquid for overcoat layer, or after coating and drying on the thin leaf substrate surface such as polyester film, Can be overlaid on the photosensitive colored layer and provided on the photosensitive colored layer. This thin leaf-shaped substrate may also serve as the protective film.

The overcoat layer should be provided uniformly.
It is important to get homogeneous performance. Therefore, the polymer of the overcoat layer needs to be formed using a uniform solution containing these polymers. The homogeneous solution means a uniformly dispersed solution or a uniformly dissolved solution.
The uniformly dissolved solution is advantageous in that a stable and uniform film can be formed. In the first place, the polymer itself is a polymer that can be dissolved or swelled in an aqueous developer, so that the solvent must be mainly water in order for the overcoat layer coating solution to become a soluble system. Therefore, the coating liquid for the overcoat layer is preferably a water-soluble liquid containing water as a main component. In the overcoat layer of the present invention, an ultraviolet absorber is added to the water-friendly material.
Further, when a protective film is laminated on the overcoat layer, it is more preferable to further contain a release agent.

As the ultraviolet absorber used in the present invention, known ones can be used as long as they have a water affinity. For example, salicylate-based UV absorbers, benzotriazole-based UV absorbers, benzophenone-based UV absorbers, benzoate-based UV absorbers, cyanoacrylate-based UV absorbers, oxalic acid anilide-based UV absorbers, etc. Those having an affinity may be selected and used. Further, as long as it has the ability to absorb ultraviolet rays, even compounds which are not usually classified as ultraviolet absorbers can be suitably used because they meet the purpose of the present invention. An example thereof is a fluorescent whitening agent. Examples of the fluorescent whitening agent include a benzoxazolyl-based fluorescent whitening agent and a stilbene-based fluorescent whitening agent. These compounds may be used alone or in combination of two or more.

The ultraviolet absorber needs to move to the developing solution at the time of development, and the effect of the present invention is achieved because the overcoat layer coating solution is a solution containing water as the main solvent as described above. In order to do so, the UV absorber used must have a water affinity. Further, if the ultraviolet absorber is water-soluble, it also has the effect of assisting the transfer of the polymer used in the overcoat layer to the developer. That is, it is better that the water-soluble lower molecular weight substance is present in the layer,
The developer easily penetrates into the layer, and the overcoat layer easily moves into the developer. If it has a non-water affinity, it is necessary to disperse it uniformly in the coating liquid, which is not always easy. For example, they settle or float in the liquid. In addition, the dispersion system has the ability to absorb light on the surface of the particles, and the molecule at the center of the particle cannot sufficiently exhibit its ability. On the other hand, if it is a dissolution system, all molecules can be effectively utilized, and a large effect can be expected with the same amount of use. In that respect,
The ultraviolet absorber is preferably water-soluble. In order to make an organic compound water-friendly, a hydroxyl group,
A hydrophilic group such as a sulfonic acid group or a carboxylic acid group may be used.

In the present invention, an ultraviolet absorber having a solubility of 5% or more, preferably 10% or more in water is preferable, and at least a sulfonic acid group and / or a carboxylic acid group is contained in one molecule. Those having at least one, and preferably two or more are preferably used. Without these groups, water solubility cannot be expected. With one, the solubility is somewhat difficult. Hydroxyl groups alone are not enough.
Furthermore, the better compatibility between the polymer used for the overcoat layer and the UV absorber, the more uniform the film can be obtained and the better the effect of the UV absorber can be obtained. A combination of strong UV absorbers is preferred.

Examples of the water-affinitive UV absorber or the compound having the UV absorbing ability include Uvinal D
S-49 (manufactured by General Aniline, sodium 2,
2'-dihydroxy-4,4'-dimethoxy-5-sulfobenzophenone), Shigenox M-87
(Hazkou Chemical Co., benzoxazolyl type?),
Shigenox M-127 (Hakko Chemical Co., benzoxazolyl type?), Tinopal SF
P (Ciba Geigy, 4,4'-bis-2-diethylamino-4- (2,5-disulfophenylamino) -s
-Triazyl-6-aminostilbene-2,2'-disulfonic acid / sodium), UNITEX MST Li
Quid New (manufactured by Ciba Geigy, anionic stilbene disulfonic acid type) and the like can be mentioned. Of these, Tinopal SFP, UNITEX MST
Liquid New is a compound classified as an optical brightener.

The amount of the ultraviolet absorber used in the present invention is
It is selected in consideration of the absorption wavelength and absorption intensity of the light source to be used and the photoconductor, but in the present invention, 1 to 5 per 1 m ^2.
It is preferably in the range of 00 mg, particularly preferably in the range of 30 to 300 mg. The content in the overcoat layer is 5 to 80% by weight, preferably 10 to 7%.
0% by weight. For example, the overcoat layer is 0.5 g /
If the content is m ² , the content of 20% corresponds to 100 mg / m ² . A release agent can be further added to the overcoat layer as described above. Especially when using a structure in which a protective film is laminated on the overcoat layer,
The addition of the release agent effectively contributes to prevent fusion between the overcoat layer and the protective film due to insufficient releasability from the protective film.

Known release agents can be used. Hereinafter, examples of release agents that are preferably used are listed. Amino-modified silicone, epoxy-modified silicone,
Carboxyl modified silicone, alcohol modified silicone, (meth) acrylic modified silicone, mercapto modified silicone, phenol modified silicone, polyether modified silicone, methylstyryl modified silicone, alkyl modified silicone, higher fatty acid ester modified silicone, higher alkoxy modified silicone, fluorinated Modified silicone such as alkyl modified silicone. Fatty acid soap, N-
Acyl amino acid and its salt, alkyl ether carboxylate, acylated peptide, alkylbenzene sulfonate, alkylnaphthalene sulfonate, naphthalene sulfonate formalin condensate, dialkylsulfosuccinate ester salt, alkylsulfoacetate salt, α-olefin sulfone Acid salt, N-acylmethyl taurine, sulfated oil, higher alcohol sulfate ester salt, secondary higher alcohol sulfate ester salt, alkyl ether sulfate salt, secondary higher alcohol ethoxy sulfate, polyoxyethylene alkylphenyl ether sulfate salt, Anionic surfactants such as monoglycer sulfate, fatty acid alkylol amide sulfate ester salt, alkyl ether phosphate ester salt, and alkyl phosphate ester salt. Cationic surfactants such as aliphatic amine salts, aliphatic quaternary ammonium salts, benzalkonium salts, benzethonium chloride, pyridinium salts and imidazolinium salts. Alkyl dimethylbedine,
Amphoteric surfactants such as aminocarboxylic acid salts and imidazolinium bedaine. Polyoxyethylene alkyl ether, single chain length polyoxyethylene alkyl ether, polyoxyethylene secondary alcohol ether, polyoxyethylene alkylphenyl ether, polyoxyethylene sterol ether, polyoxyethylene lanolin derivative, ethylene oxide of alkylphenol formalin condensate Derivatives, polyoxyethylene polyoxypropylene block polymers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene glycerin fatty acid esters, polyoxyethylene castor oil, hydrogenated castor oil, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters ,
Nonionic surfactants such as polyethylene glycol fatty acid ester, fatty acid monoglyceride, polyglycerin fatty acid ester, sorbitan fatty acid ester, propylene glycol fatty acid ester, fatty acid alkanolamide, polyoxyethylene fatty acid amide, polyoxyethylene alkylamine, and alkylamine oxide. Fluoroalkylcarboxylic acid, n-perfluorooctanesulfonylglutamate, 3- (fluoroalkyloxy) -1-alkylsulfonate, 3- (ω-fluoroalkanoyl-N-ethylamino) -1-propanesulfonate, N- (3- (perfluorooctanesulfonamide) propyl) -N, N-dimethyl-N-carboxymethylene ammonium betaine, fluoroalkylcarboxylic acid, perfluoroalkylcarboxylic acid, perfluoroactanesulfonic acid diethanolamide, perfluoroalkyl Sulfonate, N-propyl-N- (2-
(Hydroxyethyl) perfluorooctane sulfonamide, perfluoroalkyl sulfonamide propyltrimethylammonium salt, perfluoroalkyl-N-ethylsulfonylglycine salt, bis (N-perfluorooroctylsulfonyl-N-ethylaminoethyl) phosphate, mono Fluorine-based surfactants such as perfluoroalkyl ethyl phosphate, perfluoroalkyl polyoxyethylene ethanol, fluorinated alkyl ester, and perfluoroalkyl quaternary ammonium salt can be used.

The effect obtained by incorporating these release agents in the overcoat layer will be described below in the case of an image forming material in which a protective film is laminated on the overcoat layer. First of all, the image-forming material used in the transfer method for transferring only the image portion is composed of the photosensitive coloring layer and the release layer in order to easily transfer only the image from the release layer to the transferred material during the heat lamination process. Low adhesion. On the other hand, when developing after exposure, it is necessary to peel off the protective film to expose the overcoat layer. At this time, if the peeling force at the protective film / overcoat layer interface is larger than the peeling force at the photosensitive colored layer / release layer interface or the peeling force at the overcoat layer / photosensitive layer interface, the protective film after exposure When peeling off, peeling occurs except at the interface of the protective film / overcoat layer and remains as a defect of image loss in the final image. By adding a release agent to the overcoat layer, the peeling force at the protective film / overcoat layer interface can be reduced, and this problem can be solved.

Next, when the peeling force of the protective film / overcoat layer is large, the image forming material is charged by peeling charging. Due to this charging, the image forming material clings to the processor in the subsequent transfer process, and an unreasonable force is applied to the image forming material, which causes positional displacement. Therefore, the misalignment can be reduced by reducing the peeling force when the release agent is added. further,
As the release agent of the present invention, the surface tension of a 1% by weight aqueous solution is preferably 30 dynes / cm or less, and more preferably 28 dynes / cm. By using this, the surface tension of the overcoat layer can be lowered.
This makes it possible to improve the coatability of the coating solution for the overcoat layer onto a film having a low free energy surface such as polyolefin such as polyethylene or polypropylene in addition to the polyester film. If the coatability of the overcoat layer is poor, the elution time of the overcoat layer into the developer becomes uneven depending on the location, and the net development time of the photosensitive colored layer varies depending on the location, resulting in uneven development. Cause a defect that the final image is uneven. Therefore, the addition of the release agent is effective in improving the quality of the final finished image through improving the coatability of the overcoat layer.

Further, the release agent is preferably a water-based one having water dispersibility, water solubility, etc., as in the case of the overcoat polymer and the ultraviolet absorber, and particularly when prepared in a 5% by weight aqueous solution. It is more preferable to use a water-soluble substance that can be dissolved in to form a transparent solution, and further preferable to be able to prepare a 20% by weight uniform transparent aqueous solution. If the solubility in water is low, in the coating and drying steps of the overcoat layer,
It becomes difficult to form a uniform overcoat layer by causing uneven drying.

Among these, modified silicones and fluorine-containing surfactants are more preferably used, and particularly preferable are polyoxyethylene-modified silicone, polyoxypropylene-modified silicone, polyoxyethylene-polyoxypropylene-modified silicone and the like. Fluorine-based surfactants such as polyether-modified silicone, potassium salt of perfluoroalkylcarboxylic acid, perfluoroalkyl quaternary ammonium iodide salt, perfluoroalkylpolyoxyethylene ethanol, potassium salt of perfluoroalkylsulfonic acid You can Examples of these include SILWET L-7002 and SILWET L manufactured by Nippon Unicar Co., Ltd.
-7600, SILWET L-7602, SILWE
TL-7604, SILWET L-7607N, 3
Florard FC129 and Florard FC1 manufactured by M Company
35, Florard FC170C, Florard FC9
5, Fluorard FC171 and the like.

The amount of the release agent added is 0.5 to 20% by weight, preferably 1 to 10% by weight in the overcoat layer. The protective film in the present invention can be provided on the overcoat layer for protecting the surface properties of the photosensitive coloring layer and the overcoat layer. What can be used for the protective film is not particularly limited as long as it is a film or sheet having excellent mechanical properties and surface properties. Specific examples thereof include the same as the above-mentioned transparent support. In this case, the film thickness is 1 to 200 μm, preferably 5 to 100 μm
m.

The method for producing the image-forming material of the present invention is not particularly limited, and each layer may be sequentially formed on the support as described above, but the overcoat layer may be formed on the protective film. To make a film with
On the other hand, a method in which a photosensitive colored layer is provided on a support and the both are laminated is preferable because it is easy to form a smooth film. At this time, it is more preferable to use a release agent having a small surface tension as described above, and a uniform overcoat layer can be obtained. The method used for coating can be arbitrarily selected from the same coating methods as those for the photosensitive layer.

An image forming method using the image forming material of the present invention will be described below with reference to an example of a multicolor image using four colors, but the present invention is not limited to this description. That is, first, the color separation screen film and the colored image forming material corresponding to each color are brought into close contact with each other, and image exposure is performed by irradiating light such as ultraviolet rays. As a light source, a mercury lamp,
Ultra-high pressure mercury lamps, metal halide lamps, tungsten lamps, xenon lamps, fluorescent lamps, etc. are used. Similarly, the same is performed for the other three colors.

Next, each exposed material is liquid-developed with a developing solution, washed with water and dried to form an image area. In this case, as another developing method, for example,
As shown in JP-A-269349, an image portion can be formed by using a method of performing peeling development by peeling a cover sheet instead of liquid development using a developing solution.

Next, after exposing and developing as described above to form an image portion, the formed image portion is transferred to a material to be transferred to obtain a transferred image. In this case, it is preferable to adopt a format in which only the formed image portion is transferred, because the transferred image becomes very close to a printed matter. That is, a first color image is formed on the first color image forming material, and at least the color image is transferred to a material to be transferred, and the support is released.
Further, after the second color colored image is formed on the second color colored image forming material, the second color image thus formed is aligned (registered) on the transfer material to which the first color image has already been transferred. Transfer while performing the matching), peel off the support 2
Obtain a color-matched image. Similarly, the third color and the fourth color (if necessary, more images) are transferred onto the same transfer-receiving material, and a multicolor image is obtained. In some cases, the multicolor image may be indirectly transferred onto another transfer-receiving material to obtain a final multicolor image. Incidentally, this type of method is disclosed in JP-A-47-41830, JP-A-59-97140,
No. 60-23649 and U.S. Pat. No. 3,775,
No. 113. At this time, it is possible to adopt a mode in which only the image portion is directly transferred and laminated on the material to be transferred from the image obtained on the support. That is, it is preferable that substantially only the image layer for forming an image is transferred and laminated.

A transfer method is disclosed in Japanese Patent Laid-Open No. 3-1205.
It is also preferable to adopt the method described in Japanese Patent Publication No. 52-52. In this case, substantially only the image layer forming an image is transferred and laminated, and the transfer is directly performed on the actual paper, so that the transfer process is reduced by one time compared with the indirect transfer method. Therefore, the work time is shortened, and since the adhesive image-receiving sheet used for indirect transfer is not used, the work for aligning the image-receiving sheet and the support on which the image is formed is easy, and therefore workability is improved. And particularly preferred.

Further, it is general to apply heat and / or pressure during the transfer. The temperature and pressure at this time greatly vary depending on the layer constitution and the components constituting each layer. Usually, the temperature is from room temperature to 140 ° C., and the pressure is from 0 to 20 kg / cm ^2.
C. and a pressure in the range of 3 to 10 kg / cm ² are preferable. This condition can be obtained by various known devices. For example, a method of passing between heat rolls as disclosed in JP-A-62-80658 can be used. Further, the method described in JP-A-3-120552 is also preferably used.

Various methods are used as the method of position alignment (registration). For example, by fixing the image by adhering the support after image formation on the adhesive support, a method for preventing displacement and using the pin holes used to adhere the color separation original at the time of exposure, the register pin This is a method of performing registration using a bar. The former is JP-A-6
As described in JP-A-3-78788 and JP-A-2-19148, the present invention preferably employs the latter method using a register pin bar.

Examples of the image receiving material include paper such as high quality paper, art paper and coated paper, plastic film such as polyester film and acetate film or an intermediate layer, plastic film coated with an image receiving layer, metal such as aluminum foil and copper foil. Foil or a composite material thereof is used.

[0053]

The present invention will be described in detail with reference to the following examples, but the present invention is not limited to these examples. Example 1 (Support) On a biaxially stretched polyethylene terephthalate film (width 65 cm) having a thickness of 75 μm, an ethylene-vinyl acetate copolymer resin (Mitsui-DuPont Polychemical Co. E
VAFLEX P-1405: vinyl acetate content 14% by weight, VICAT softening point 68 ° C.) was laminated by extrusion lamination method to form a 25 μm thick release layer.
(Preparation of photosensitive layer) 4 of the following composition on the above-mentioned support
Each color photosensitive solution was applied and dried using a bar coater to form a photosensitive colored layer having a dry film thickness of 1.5 μm. (Negative type photosensitive layer coating liquid composition)

[0054]

[Table 2] Vinyl acetate-vinyl versatate copolymer (80:20 wt%, weight average molecular weight 150,000, 50% methanol solution) 10 parts by weight Pentaerythritol tetraacrylate 6 parts by weight 2,4-diethylthioxanthone 1.2 parts by weight Parts 4-dimethylaminobenzoic acid ethyl ester 1.2 parts by weight bis- (2- (3'chloro), 4,6-diphenylimidazole) 0.5 parts by weight paramethoxyphenol 0.2 parts by weight 2-butanone 64 parts by weight Part The following pigments (pigments)

[0055]

[Table 3] Black: Carbon black MA-100 (manufactured by Mitsubishi Chemical Corporation) 1.65 parts by weight Cyan: Cyanine blue 4920 (manufactured by Dainichi Seika) 1.20 parts by weight Magenta: Seika First Carmine 1483 (manufactured by Dainichi Seika) ) 2.50 parts by weight Yellow: Seika First Yellow 2400 (manufactured by Dainichi Seika) 1.65 parts by weight

On a biaxially stretched polyethylene terephthalate film (width 70 cm) having a thickness of 25 μm, an overcoat layer solution having the following composition was applied using a bar coater to a dry film thickness of 0.5 μm and dried. The film with the overcoat layer and the above-mentioned film on which the photosensitive layer had been coated were laminated so that their coated surfaces face each other, and were laminated by pressing with a laminator. To confirm the solubility of the UV absorber in water, add T to 100 g of water at 25 ° C.
When 10 g of inopal SFP (manufactured by Ciba-Geigy) was added and stirred for 10 minutes, it was uniformly dissolved and a transparent solution was obtained. Further, the surface tension of a 1% aqueous solution of SILWET L-7607N (polyether-modified silicone) manufactured by Nippon Unicar Co., Ltd. used as a release agent (25
C.) was 22.0 dynes / cm. (Composition of coating liquid for overcoat layer)

[0057]

[Table 4] Polyvinyl alcohol (GL-05 manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) 1.0 part by weight Hydroxypropyl methylcellulose (TC-5 manufactured by Shin-Etsu Chemical Co., Ltd.) 1.0 part by weight Release agent (Nippon Unicar Co., Ltd.) SILWET L-7607N) 0.1 part by weight Optical brightener (Tinopal SFP manufactured by Ciba Geigy) 1.0 part by weight Demineralized water 67.0 parts by weight

(Transfer Image Forming Method) The colored image forming material of four colors obtained as described above was cut into a size of 910 mm × 620 mm, and a positioning hole was opened using a puncher made by Stosur Co. A1 size color separation network film of each color is superposed on the support surface of the terephthalate film surface, and while aligning using a pin bar made by Stosur, using a bright room printer P-647-GA made by Dainippon Screen Co., Ltd. Image exposure was performed for 60 seconds from the support side at the maximum exposure intensity. Next, after peeling off the protective film from the colored image-forming material,
Development was carried out by immersing in the following developer at 32 ° C. for 30 seconds to form a 4-color colored image. The surface of the overcoat layer after peeling the protective film was observed, but no particular abnormality was observed. (Developer) Sodium silicate 25 g Sodium hydroxide 5 g Surfactant (Perox NBL manufactured by Kao Corporation) 250 g Demineralized water 1000 g

The four sheets on which the above colored images are formed are
And described in Example 1 of JP-A-3-120552.
The transfer image of 4 colors is formed on the art paper by the method
did. Drum temperature is 70 ℃, press roll temperature is 110
℃, roll pressure 4kg / cm ²It is. The image obtained is
It has good transferability and is produced by normal offset printing.
It was very similar to the image of the printed matter. (Evaluation of misalignment) Four sheets on which the above-mentioned colored image is formed
Example 1 of Japanese Patent Laid-Open No. 3-120552
According to the described method, the size of 636mmX939mm
Tokubishi art paper (thickness 127.9 g / cm²) 4 colors on top
An image is formed and the position between the four colors is determined using a 100x microscope.
As a result of observing the most displaced position,
It was 100 μm or less.

(Evaluation of Peelability) Ten colored image-forming materials cut out in a size of 910 mm × 620 mm were prepared,
Bright room printer manufactured by Dainippon Screen Co., Ltd.
After performing image exposure for 60 seconds at the maximum exposure intensity using P-647-GA, observe the surface of the overcoat layer after peeling the protective film, and peel at the interface between the release layer on the support and the photosensitive layer. It was examined how many of the 10 colored image forming materials were prepared. When the result was 0 out of 10, the result was excellent, 1 was excellent, 2 was good, and more was unacceptable. As a result of the peelability evaluation, the number of colored image-forming materials peeled off at the interface between the release layer on the support and the photosensitive layer was excellent, not one in ten sheets.

(Evaluation of halftone dot reproducibility) A Ugra offset inspection kyle was superposed on the support surface of the colored image forming material cut into an appropriate size, and a bright room printer P-647-manufactured by Dainippon Screen Co., Ltd. Using GA, exposure was performed from the side of the support at an exposure amount adjusted so that 2% halftone dots of the Uygra offset inspection Kyle were reproduced. Next, after peeling off the protective film from the colored image-forming material, development was carried out by immersing the protective film in the above-mentioned developing solution at 32 ° C. for 30 seconds to form a total of four colored images of four colors. This was transferred separately to the art paper without superimposing four colors by the above-mentioned method, and the reproducibility of 95% halftone dot was evaluated in the transferred image for each color.
In the results, those in which all 95% halftone dots were reproduced were excellent, those in which 90% or more were reproduced were excellent, those in which 90% were reproduced were good, and those below were not. The result of the dot reproducibility evaluation was excellent.

Example 2 The release agent in the overcoat layer solution in Example 1 was
Nippon Unicar Co., Ltd. SILWET L-5310
A negative image-forming material was prepared in the same manner as in Example 1 except that the (polyether-modified silicone) was used, and then a transfer image was formed on art paper in the same manner. 1% of the release agent
When the surface tension (25 ° C.) of the aqueous solution was measured, it was 30.
It was 5 dynes / cm. As a result, the dot reproducibility was excellent. The results of the peelability evaluation were excellent. Further, when the position shift was measured, the position where the four colors were most shifted was observed, and as a result, the position shift was 150 μm. As a result of superimposing four sheets of image forming materials for four colors after the exposure and development using the pin bar and observing the most misaligned position between the four colors, the misalignment was 30 μm or less.

Example 3 A negative image-forming material was prepared in the same manner as in Example 1 except that the amount of the fluorescent whitening agent in the overcoat layer solution in Example 1 was reduced by half, and the same procedure was followed. A transfer image was formed on the paper. As a result, the dot reproducibility was excellent. The results of the peelability evaluation were excellent. Further, when the position shift was measured, the position where the four colors were most shifted was observed, and as a result, the position shift was 100 μm. As a result of superimposing four sheets of image forming materials for four colors after the exposure and development using the pin bar and observing the most misaligned position between the four colors, the misalignment was 30 μm or less.

Example 4 The overcoat layer liquid used in Example 1 was coated on the photosensitive layer of the film coated with the four color photosensitive layers in Example 1 using a bar coater so that the dry film thickness was 0.5 μm. ,
Dried. No cover film was provided. Thereafter, exposure, development, and transfer are performed in the same manner as in the example, and the image is printed on the art paper.
A color transfer image was formed. As a result, the dot reproducibility was excellent. When the displacement was measured by the method described in Example 1, the position where the four colors were most displaced was observed. As a result, the displacement was 200 μm or more. As a result of superimposing four sheets of the image forming materials for four colors after exposure and development using the pin bar and observing the most misaligned position between the four colors, the misalignment was 150 μm.

Comparative Example 1 A negative image-forming material was prepared in the same manner as in Example 1 except that the optical brightening agent and the release agent were removed from the composition of the overcoat layer solution in Example 1, and so on. A transfer image was formed on the art paper. After exposure, when the protective film was peeled off, there was a part where it was peeled off at the interface between the release layer on the support and the photosensitive layer, not at the interface between the protective film and the overcoat layer. It remained as a defect in the final image as missing. At the time of peeling the protective film, static electricity was remarkably generated along with peeling noise, and electric shock was often felt during the work, making the work difficult. Therefore, the result of the peelability evaluation was unsatisfactory. In addition, the result of evaluation of dot reproducibility was not possible. As a result of the positional shift evaluation, as a result of observing the position where the positions among the four colors are most shifted, the positional shift was 200 μm or more. In addition, as a result of superimposing four sheets of image forming materials for four colors after exposure and development using the pin bar and observing the most deviated position between the four colors, the positional deviation is 30 μm or less. Turned out to be what happened during the transfer process.

Comparative Example 2 A negative image-forming material was prepared in the same manner as in Example 1 except that the composition of the overcoat layer solution in Example 1 was changed to the composition excluding the fluorescent whitening agent, and the same procedure was followed. A transfer image was formed on the paper. As a result, the focus reproducibility is 9
As a result of measuring the weight of the halftone dot at the 0% halftone dot portion, it was not possible. The results of the peelability evaluation were excellent. As a result of measuring the positional deviation, the resulting image had good transferability and was close to the image of a printed matter prepared by ordinary offset printing. As a result of observing the position where the positions of the four colors are most displaced, the displacement is 100 μm.
It was below.

Comparative Example 3 A bar coater was applied to the photosensitive layer of the four-color photosensitive layer-coated film in Example 1 with an overcoat layer coating solution having the following formulation so that the dry weight was 0.5 g per square meter. It was applied and dried. The coating liquid was not a dissolved liquid, but a dispersion process was performed to disperse the ultraviolet absorber, but it was not uniform. Therefore, a uniform surface could not be obtained at the time of application, and the surface became uneven and uneven. This is subjected to the same exposure, development and transfer as in Example 1,
Transfer images of four colors were formed on art paper. As a result, the focus reproducibility was good, but there was some variation depending on the test location.

When the positional deviation was measured by the method described in Example 1, the most deviated position among the four colors was observed. As a result, the positional deviation was 200 μm or more. In addition,
As a result of superimposing four sheets of image forming materials for four colors after exposure and development using the pin bar and observing the position where the four colors were most displaced, the displacement was 150 μm and I knew it was happening. (Composition of coating liquid for overcoat layer) Polyvinyl alcohol (GL-05 manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) 1.0 part by weight Hydroxypropyl methylcellulose (TC-5 manufactured by Shin-Etsu Chemical Co., Ltd.) 1.0 part by weight Ultraviolet absorber (2,4-dihydroxybenzophenone) 1.0 part by weight Demineralized water 67.0 parts by weight

[0069]

When the image forming material of the present invention is used as a color proof, for example, halation is prevented, so that an image having good halftone dot reproducibility can be obtained.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location G03F 7/022 G03F 7/022 7/027 502 7/027 502 (72) Inventor Junko Tadano Kanagawa Prefecture 1000 Kamoshida-cho, Aoba-ku, Yokohama-shi Mitsubishi Chemical Corporation Yokohama Research Institute (72) Inventor St. Goto 1 Sakura-cho, Hino-shi, Tokyo Konica Co., Ltd. (72) Miyuki Hosoi 1 Sakura-cho, Hino-shi, Tokyo Konica Stock Company

Claims (12)

[Claims] 1. An image forming material having a structure in which a release layer, a photosensitive coloring layer and an overcoat layer are provided in this order on a support, wherein the overcoat layer contains a water-affinitive UV absorber. An image forming material characterized in that 2. The image forming material according to claim 1, wherein the ultraviolet absorber is a water-soluble ultraviolet absorber having two or more sulfone groups and / or carboxyl groups in one molecule. . 3. The image forming material according to claim 1, wherein the ultraviolet absorber is a fluorescent brightening agent. 4. The protective film is laminated on the overcoat layer, and the overcoat layer remains on the side of the photosensitive colored layer when the protective film is peeled off. Image forming material. 5. The image forming material according to claim 1, wherein the overcoat layer contains a release agent. 6. The image forming material according to claim 1, wherein the release layer contains an ethylene-vinyl acetate copolymer having a softening point of 50 to 120 ° C. 7. The photosensitive color layer is a photopolymerizable composition containing a colorant, a compound having at least one addition-polymerizable group, and a photopolymerization initiator.
7. The image forming material described in 6 above. 8. The image forming material according to claim 1, wherein the overcoat layer is formed by using a water-soluble water-based overcoat layer coating liquid. 9. The image forming material according to claim 1, wherein the solubility of the ultraviolet absorber in water is 5% or more. 10. The solubility of the ultraviolet absorber in water is 10.
% Or more, and the image forming material according to claim 1. 11. The image forming material according to claim 1, wherein the content of the ultraviolet absorber in the overcoat layer is 10% or more. 12. The image forming method of exposing the image forming material according to claim 1 to 11, wherein at the time of exposure, the support is exposed to light from the side opposite to the photosensitive colored layer.